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The diverse array of cellular phenotypes is seen at the level of cellular localization, nuclear mobility, homodimerization, and dimerization with the <jats:styled-content style=\"fixed-case\">FIT<\/jats:styled-content>\u2010activating partner <jats:styled-content style=\"fixed-case\">bHLH<\/jats:styled-content>039, promoter transactivation, and protein stability. Phospho\u2010mimicking Tyr mutations of <jats:styled-content style=\"fixed-case\">FIT<\/jats:styled-content> disturb <jats:italic>fit<\/jats:italic> mutant plant complementation.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>Taken together, we provide evidence that <jats:styled-content style=\"fixed-case\">FIT<\/jats:styled-content> is activated through Ser and deactivated through Tyr site phosphorylation. 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